Yes! You are correct.
One NADH is made as pyruvate enters the Krebs cycle. Three more NADH are made in the cycle, so there is a total of 4 NADH molecules made. Each one will cause the production of 3 ATPs, so 4x3 = 12 ATPs will get produced by the NADH.
One GTP molecule will be made, which will cause the production of one ATP molecule.
And one FADH2 molecule will be made, causing the production of 2 ATP molecules.
| In summary from one pyruvate: |
| 4 NADH |
x3 |
12 ATP |
| 1 GTP |
x1 |
1 ATP |
| 1 FADH2 |
x2 |
2 ATP |
| Total ATP = |
15 ATP |
|